

public class Searching{

    public static void main(String[] args) {

        int count = 0;

        for(int i = 1;i <= 100;i ++){
            if(i % 10 == 9 || i / 10 == 9){
                count ++;
                if(i % 10 == 9 && i / 10 == 9){
                    count ++;
                }
            }
        }
        System.out.println(count);
    }
}